参数资料
型号: ADV7188BSTZ
厂商: Analog Devices Inc
文件页数: 66/112页
文件大小: 0K
描述: IC DECODER VID MULTIFORM 80LQFP
标准包装: 1
类型: 视频解码器
应用: 机顶盒,视频播放器,录音机
电压 - 电源,模拟: 3.15 V ~ 3.45 V
电压 - 电源,数字: 1.65 V ~ 2 V
安装类型: 表面贴装
封装/外壳: 80-LQFP
供应商设备封装: 80-LQFP(14x14)
包装: 托盘
ADV7188
Rev. A | Page 57 of 112
The checksum value of B8 to B0 is equal to the nine LSBs
of the sum of the nine LSBs of the DID, SDID, and dc, as
well as all UDWs in the packet. Prior to the start of the
checksum count cycle, all checksum and carry bits are
preset to 0. Any carry resulting from the checksum count
cycle is ignored.
EP. The MSB, B9, is the inverse of EP. This ensures that
restricted Codes 0x00 and 0xFF do not occur.
Line_number [9:0]. The number of the line that immediately
precedes the ancillary data packet. This number is as per the
numbering system of ITU-R BT.470, ranging from 1 to 625
in a 625-line system and from 1 to 263 in a 525-line system.
Note that the line on which the packet is output differs from
the line on which the VBI data was sliced due to the vertical
delay through the comb filters.
Data Count. The data count specifies the number of UDWs
in the ancillary stream for the standard. The total number
of user data-words is four times the data count. Padding
words can be introduced so that the total number of UDWs
is divisible by 4.
Table 71. Ancillary Data in Nibble Output Format
Byte
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Description
0
1
2
1
Ancillary data preamble.
3
EP
0
I2C_DID6_2 [4:0]
0
DID (data identification
word).
4
EP
I2C_SDID7_2 [5:0]
0
SDID (secondary data
identification word).
5
EP
0
DC [4:0]
0
Data count.
6
EP
padding [1:0]
VBI_DATA_STD [3:0]
0
ID0 (User Data-Word 1).
7
EP
0
Line_number [9:5]
0
ID1 (User Data-Word 2).
8
EP
Even_Field
Line_number [4:0]
0
ID2 (User Data-Word 3).
9
EP
0
VDP_TTXT_TYPE
[1:0]
0
ID3 (User Data-Word 4).
10
EP
0
VBI_WORD_1 [7:4]
0
User Data-Word 5.
11
EP
0
VBI_WORD_1 [3:0]
0
User Data-Word 6.
12
EP
0
VBI_WORD_2 [7:4]
0
User Data-Word 7.
13
EP
0
VBI_WORD_2 [3:0]
0
User Data-Word 8.
14
EP
0
VBI_WORD_3 [7:4]
0
User Data-Word 9.
.
n 3
1
0
n 2
1
0
Pad 0x200. These
padding words may not
be present depending
on ancillary data type.
User Data-Word XX.
n 1
B8
Checksum
0
CS (checksum word).
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